This morning I found one of my hens (not quite a year old) back in the nesting box laying a second egg. This afternoon when I let them out to graze in the yard she was not with the other 5. I found her, brought her out and she immediately started drinking a lot of water (it is 34 degrees out) and had a very wet, brown poop. Now she is standing by herself by the garage door. The others are pecking and scratching as normal. Is she OK? I took Harriet to the vet soon after I posted this. She was drooling and regurgitating. It's been a few hours, they still don't know what is wrong and are doing tests and giving her antibiotics. My heart is aching.